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SECURITIES - Held to Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
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Held-to-maturity Securities [Abstract] |  |
Amortized cost | $ 596,803 | $ 619,853
Gross unrealized gains | 2,468 | 12,807
Gross unrealized (losses) | (4,848) | (86)
Securities held to maturity | 594,423 | 632,574
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 416,915 | 24,264
LESS THAN 12 MONTHS, Unrealized (Losses) | (4,828) | (55)
OVER 12 MONTHS, Fair Value | 1,329 | 2,256
OVER 12 MONTHS, Unrealized (Losses) | (20) | (31)
TOTAL, Fair Value | 418,244 | 26,520
TOTAL, Unrealized (Losses) | (4,848) | (86)
AMORTIZED COST |  |
Due in one year or less | 341 | 472
Due after one year through five years | 17,723 | 12,502
Due after five years through ten years | 152,790 | 157,944
Due after ten years | 303,452 | 315,177
Total | 474,306 | 486,095
Mortgage-backed securities | 122,497 | 133,758
Amortized cost | 596,803 | 619,853
FAIR VALUE |  |
Due in one year or less | 340 | 471
Due after one year through five years | 17,814 | 12,696
Due after five years through ten years | 153,428 | 163,806
Due after ten years | 301,861 | 321,166
Total | 473,443 | 498,139
Mortgage-backed securities | 120,980 | 134,435
Total held to maturity securities | 594,423 | 632,574
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 454,129 | 465,469
Gross unrealized gains | 2,397 | 11,744
Gross unrealized (losses) | (3,188) | (11)
Securities held to maturity | 453,338 | 477,202
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 283,033 | 1,294
LESS THAN 12 MONTHS, Unrealized (Losses) | (3,188) | (11)
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 283,033 | 1,294
TOTAL, Unrealized (Losses) | (3,188) | (11)
AMORTIZED COST |  |
Amortized cost | 454,129 | 465,469
FAIR VALUE |  |
Total held to maturity securities | 453,338 | 477,202
Mortgage-backed Securities [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 122,497 | 133,758
Gross unrealized gains | 0 | 708
Gross unrealized (losses) | (1,517) | (31)
Securities held to maturity | 120,980 | 134,435
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 120,980 | 20,061
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,517) | (31)
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 120,980 | 20,061
TOTAL, Unrealized (Losses) | (1,517) | (31)
AMORTIZED COST |  |
Amortized cost | 122,497 | 133,758
FAIR VALUE |  |
Total held to maturity securities | 120,980 | 134,435
Obligations of States and Political Subdivisions [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 20,177 | 20,626
Gross unrealized gains | 71 | 355
Gross unrealized (losses) | (143) | (44)
Securities held to maturity | 20,105 | 20,937
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 12,902 | 2,909
LESS THAN 12 MONTHS, Unrealized (Losses) | (123) | (13)
OVER 12 MONTHS, Fair Value | 1,329 | 2,256
OVER 12 MONTHS, Unrealized (Losses) | (20) | (31)
TOTAL, Fair Value | 14,231 | 5,165
TOTAL, Unrealized (Losses) | (143) | (44)
AMORTIZED COST |  |
Amortized cost | 20,177 | 20,626
FAIR VALUE |  |
Total held to maturity securities | $ 20,105 | $ 20,937

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